Niobium—an athermal plateau in the low-temperature yield stress
- 1 September 1987
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 56 (3) , 329-342
- https://doi.org/10.1080/01418618708214389
Abstract
The tensile deformation behaviour of high-purity niobium single crystals has been evaluated at temperatures between 4·2 and 77 K. An athermal plateau in the yield and thermal stresses between 40 and 77 K has been demonstrated. Anomalies were observed in the strain-rate sensitivity at all temperatures within this plateau region. Alloying with 1 at.% Mo or 10 at.% Ta eliminates the plateau, although anomalous slip remained the dominant mode of deformation. The significance of these observations is discussed in the light of an interpretation of the mechanisms of anomalous slip, involving a transition from athermal to thermally activated control of plastic flow.Keywords
This publication has 12 references indexed in Scilit:
- The deformation of niobium single crystals at temperatures between 77 and 4.2 KPhilosophical Magazine A, 1981
- A microscopic mechanism for steady state inhomogeneous flow in metallic glassesActa Metallurgica, 1977
- Suppression of anomalous slip by oxygen interstitials in vanadiumScripta Metallurgica, 1977
- Microplasticity in Vanadium single crystalsActa Metallurgica, 1976
- Stress-strain curves for niobium crystals deformed at temperatures below ambientPhilosophical Magazine, 1976
- Anomalous {110} slip and the role of co-planar double slip in BCC metalsScripta Metallurgica, 1975
- Exhaustion mechanisms in the Preyield domain of niobium single crystals at low temperaturesJournal de Physique, 1975
- The thermally activated deformation of niobium-molybdenum and niobium-rhenium alloy single crystalsPhilosophical Magazine, 1972
- A detailed study of the deformation of high purity niobium single crystalsPhilosophical Magazine, 1969
- The forest dislocation as a source of cross-slipPhilosophical Magazine, 1965